text: Replacement of ligands by the nitrosyl cation may be accomplished using nitrosyl tetrafluoroborate. This reagent has been applied to the hexacarbonyls of molybdenum and tungsten:
  :M(CO) + 4MeCN + 2NOBF → [M(NO)(MeCN)](BF)
  Nitrosyl chloride and molybdenum hexacarbonyl react to give [Mo(NO)Cl].  Diazald is also used as an NO source.